WO1991007637A1 - Detonation a distance de charges explosives - Google Patents

Detonation a distance de charges explosives Download PDF

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Publication number
WO1991007637A1
WO1991007637A1 PCT/US1989/005074 US8905074W WO9107637A1 WO 1991007637 A1 WO1991007637 A1 WO 1991007637A1 US 8905074 W US8905074 W US 8905074W WO 9107637 A1 WO9107637 A1 WO 9107637A1
Authority
WO
WIPO (PCT)
Prior art keywords
unit
control unit
conmand
coded
status
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/US1989/005074
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English (en)
Inventor
Carl N. Guerreri
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Electronic Warfare Associates Inc
Original Assignee
Electronic Warfare Associates Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Electronic Warfare Associates Inc filed Critical Electronic Warfare Associates Inc
Publication of WO1991007637A1 publication Critical patent/WO1991007637A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42C—AMMUNITION FUZES; ARMING OR SAFETY MEANS THEREFOR
    • F42C11/00—Electric fuzes
    • F42C11/06—Electric fuzes with time delay by electric circuitry
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42C—AMMUNITION FUZES; ARMING OR SAFETY MEANS THEREFOR
    • F42C13/00—Proximity fuzes; Fuzes for remote detonation
    • F42C13/04—Proximity fuzes; Fuzes for remote detonation operated by radio waves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42C—AMMUNITION FUZES; ARMING OR SAFETY MEANS THEREFOR
    • F42C15/00—Arming-means in fuzes; Safety means for preventing premature detonation of fuzes or charges
    • F42C15/40—Arming-means in fuzes; Safety means for preventing premature detonation of fuzes or charges wherein the safety or arming action is effected electrically
    • F42C15/42—Arming-means in fuzes; Safety means for preventing premature detonation of fuzes or charges wherein the safety or arming action is effected electrically from a remote location, e.g. for controlled mines or mine fields
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42D—BLASTING
    • F42D1/00—Blasting methods or apparatus, e.g. loading or tamping
    • F42D1/04—Arrangements for ignition
    • F42D1/045—Arrangements for electric ignition
    • F42D1/05—Electric circuits for blasting
    • F42D1/055—Electric circuits for blasting specially adapted for firing multiple charges with a time delay

Definitions

  • M(__ ⁇ 3O ⁇ ND OF HIE INVENTION Ihis invention relates generally to devices and methods for remotely detonating one or more explosive charges.
  • this invention relates to the precisely timed, remote detonation of explosive charges using electrical detonators in environments having high levels of extraneous electricity including stray ground currents, electromagnetic fields and radio frequency energy.
  • any effective response by the authorities requires the use of explosives, as for example, to breach a wall, to sever the hinges or lock of a door, to create a diversion, to disperse smoke or disabling gases, or for other analogous purposes.
  • a nunber of different types or sizes of explosive devices situated at different locations are desirably employed.
  • hostage-taking events often display rapidly changing circumstances. Consequently, it is impractical and frequently undesirable to place an explosive charge having a fixed, or preset, time of detonation.
  • explosive charges are most cotrmonly detonated using electric blasting caps as initiators.
  • Non-electric blasting caps for use with safety fuse and detonating cord are also routinely used explosive charge initiators. None of these conventional techniques for detonating explosive charges is satisfactory for use in terrorist situations. Most terrorist acts and hostage-taking events occur in urban and highly congested areas. Such areas normally contain high levels of extraneous electricity, especially stray ground currents, electromagnetic fields associated with transmission lines, and radio frequency energy from IV and radio transmission and the like.
  • the remote detonation of explosive charges is accomplished by providing an individual control unit for each explosive charge.
  • Each control unit is short-coupled to its respective charge in a manner which prevents the generation of an induced current in the detonating circuit and is arranged to arm and to detonate the charge only in response to a plurality of radio-transmitted coded commands in proper sequence and repeated with proper frequency.
  • the control units are arranged so that each must be placed in an armed state by coded command before it will accept a cortmand to detonate the charge and failure of a unit to continuously receive a com ⁇ tiand to arm prevents its acceptance of a command to detonate the charge.
  • Figure 1 is a schematic diagram illustrating the major sub ⁇ systems of tne invention and their interaction;
  • Figure 2 is a system functional diagram further illustrating its operation
  • FIG. 3 illustrates the components of an individual control unit processor
  • Figure 4 shows one preferred format for the coded control messages passed between the comnand unit and the individual control unit when the latter are in a "ready" state;
  • Figure 4-A shows a preferred format for the coded control messages passed from the command unit causing individual control units to arm and fire;
  • FIG. 5 depicts in partial section an explosive charge arrangement advantageously used in the invention
  • Figure 6 shows the arrangement of a detonation switch in the deactivated position
  • Figure 6-A shows the arrangement of the switch of Figure 6 in an activated or "fire” position.
  • the detonating system of this invention shown generally at 10 includes three major sub-systems.
  • One of the sub-systems is a comnand unit 11 which includes a c ⁇ rmand console, radio transmitters and receivers and microprocessors.
  • a second sub-system comprises a translator unit 12 which is designed to act as a relay point between the co ⁇ mand unit and one or more individual control units 13.
  • the functions of translator unit 12 can be incorporated into the command unit 11 but that arrangement is much less preferred. Provision of a translator unit, as is illustrated, ensures a very strong signal for the individual control units 13 independent of multi-path reflections, transmitter fading and other radio propagation phenomena that may exist. It also allows transmitters in the individual control units 13, used to feedback status information to the command unit, to be low powered thus allowing reduced size and complexity.
  • Each individual control unit 13 contains a radio receiver which receives signals from the command unit 11 relayed through the translator 12. Individual control units also contain firing logic and firing mechanisms for detonating an explosive charge 14.
  • Charge 14 is connected to its control unit by means of signal transmitting means 15 which may be an electrical wire conductor or in certain embodiments, may be an optical fiber. Wire 15 is made sufficiently long, typically five to fifteen feet, so as to ensure that control units 13 survive the blast of charge 14 without damage.
  • cotrmand unit 11 is provided with antennas 16, for transmission of radio signal 17 for reception by antenna 18 of translator 12, and 19 for the reception of radio signal 20 broadcast by translator antenna 21.
  • Translator 12 is also arranged to broadcast signals 22, which may be a relay of signal 17, for reception by individual control units 13 through antennas 23.
  • control units 13 are arranged to broadcast a signal 24, representative of system status, by means of antennas 25.
  • Figure 2 shows the components making up each sub-system in greater detail.
  • command unit 11 is shown in dashed outline and includes a command console 31, a processor 32, a radio transmitter 33 and radio receiver 34. Both transmitter 33 and receiver 34 are preferably FM.
  • Console 31 is arranged so as to allow an operator to determine the status of any or all of the individual control units and to command the arming, disarming or firing of any or all of the explosive charges 14 either simultaneously or in any timed sequence.
  • the system is designed such that a disarm command will override all else.
  • an optional sub-system 40 comprising a closed circuit television camera 41 and an associated transmitter 42.
  • Camera 41 may be used to monitor the locations of charges 14 and transmit that picture back to closed circuit television receiver 35 via signal 43.
  • the picture may be displayed on a video monitor incorporated in cor ⁇ mand console 31.
  • Translator sub-system 12 includes an FM radio receiver 51 which is adapted to pick up signal 17 produced by cor ⁇ mand unit transmitter 33. That signal is fed to FM transmitter 52 where it is re-broadcast as signal 22 directed to individual control units 13. Sub-system 12 also includes an AM radio receiver 53 to pick up signal 24 from individual control units 13. That signal is passed to encoding- decoding processor 54 which produces a data stream re-broadcast as signal 20 by FM transmitter 55.
  • Each individual control unit 13 is provided with a command receiver 61 which is adapted to receive either the cor ⁇ mand unit signal 17 or the re-broadcast signal 22 from translator 12. That radio signal is passed to a processor-decoder means 62 which is shown in greater detail in Figure 3.
  • Processor-decoder 62 functions to arm and activate firing mechanism 63, upon proper command, thus detonating explosive charge.
  • Means 62 also performs housekeeping functions including reporting on the status of mechanism 63 and coding that status information for transmission back to translator 12 via radio signal 24 broadcast by transmitter 64.
  • Figure 3 there is shown in diagrammatic block form the components of a processor-decoder module 62 of an individual control unit 13.
  • Module 62 is designed to accept and respond to messages from the conmand unit 11, including those relayed through translator 12, to arm, disarm, or fire the explosive charge 14 associated with each individual control unit. All such messages between the command unit and the individual control units must be absolutely distinctive so that the chances of an individual control unit responding to some random signal, or to a signal directed to another individual control unit, is essentially zero. Consequently, each individual control unit is provided with an identifying code which, in a preferred embodiment, is a Mersenne prime number.
  • Figures 4 and 4-A provide examples of preferred formats of the coded messages.
  • a message includes a preamble and a designation code sequence as is diagrammed in Figure 4.
  • the preamble is processed by preamble decoder 71 and is used for synchronization of clock 72 with that of the command unit and to alert housekeeping module 73 to be ready to accept data.
  • a designation code sequence consisting of a marker identifying the beginning of a message and the designation itself.
  • the designation preferably is a Mersenne prime number.
  • the preamble and designation portions of the message are 15-bit binary words corresponding to a Mersenne prime number. Redundancy is built into the system to further reduce the possibility of the control units responding to a spurious signal. That is accomplished by the transmission of at least two separate destination codes multiple times.
  • a first designation decoder 74 and a second designation decoder 75 are provided to process the separate message codes and each decoder must correctly receive its transmitted code four out of five times in order for module 62 to recognize a valid designation. Summarizing those requirements, an individual control unit is placed on an alert status only after it has received two separate specific messages, each 15 bits long, in four out of five transmissions.
  • the twenty charges and their control units are numbered sequentially and that four of the charges, numbers 3, 11, 12 and 17, are designated for simultaneous detonation.
  • the clock 72 of each of the twenty individual control units is synchronized with the clock of the cor ⁇ mand unit and each control unit then watches to see if its designations are being transmitted.
  • the stream of digital data from the receiver 61 of each individual control unit is fed to module 62.
  • Each of the twenty individual control units has a specific prime number for each decoder, or two prime numbers per unit, which it is set to recognize.
  • the sets of prime numbers corresponding to each of control units 3, 11, 12 and 17 are broadcast in the signal format illustrated in Figure 4.
  • both decoders 74 and 75 recognize their respective prime numbers in at least four of five transmissions, then the individual control unit is placed on alert status where it can accept further instructions. At that point, a signal is sent to the housekeeping component 73 indicating that its individual control unit has been designated by the command unit. Component 73 then sends a message to transmitter 64, confirming the decision, for broadcast back to translator 12. That information is decoded, combined with similar information from the other individual control units, and is transmitted back to the command unit. When the message is received by the command unit, it is decoded in processor 32 and displayed on the co ⁇ mand console 31. That console preferably includes visual indication of the status of each individual control unit.
  • the console would show by appropriate indicia that control units 3, 11, 12 and 17 were in an alert status while the remaining sixteen units were inactive.
  • encoded messages are transmitted continuously to the individual control units and those units continuously transmit confirmations back to the command unit. Control units under an alert status may be removed from that status by the official in charge at will and other units can be designated.
  • the new message format includes a 20- bit binary word which commands the individual control unit to arm its circuits. This new message is received and processed in the arming command decoder 76 which in turn transmits the co ⁇ mand to the arm logic discriminator 77.
  • Arm logic discriminator 77 performs two functions. First, it monitors the status of the system to ensure that a disarm command has not been issued. The official in control of the command console always has the ability to transmit a disarm signal. That signal is received and processed in the disarm command decoder 78 and the conmand is then transmitted to the arm logic discriminator 77. Discriminator 77 is arranged so as to give a disarm signal a higher priority than an arm signal. A disarm co ⁇ mand prevents discriminator 77 from passing the command through to the arming logic circuit 79. The second function of the arming logic discriminator 77 is to keep track of how long it has been since the last arming conmand was received.
  • the system is designed so that it must receive a new arm conmand periodically else it reverts back to the alert status. Preferably, a new arm command must be received once every three frames of data for the system to remain armed. If the arming logic discriminator determines that the arming conmand is valid, that there has been no disanm command and that the arming command has occurred frequently enough, it then passes positive confirmation of arming to the arming logic circuit 79.
  • the housekeeping component 73 of the processor 62 monitors the arming logic circuit 79 ad determines that the individual control unit is in the armed mode. It encodes this data and sends it back to the conmand unit where the command console 31 provides the responsible official with visual confirmation that the arm signal has been received by the designated individual control unit.
  • the visual confirmation may, for example, take the form of a status light provided for each individual control unit which will be illuminated whenever the unit is in an armed status.
  • the only thing yet required to cause the designated individual control units to detonate their respective explosive charges is to transmit a firing command. If prior to issuing a fire command the responsible official decides to disarm the designated units, he may issue a disarm signal which causes the designated units to come out of the arm position and revert back to an alert status. Alternatively, the system allows for each or all of the individual control units to be de-designated by appropriate conmand thus providing redundancy in the disarming circuits.
  • the explosive charges associated with their respective individual control units, in this example units 3, 11, 12 and 17, can now be detonated at will by the activation of a fire switch located at the conmand console 31. That will cause a fire cor ⁇ mand to be encoded on the data stream in a format such as is diagrammed in Figure 4-A.
  • the conmand is transmitted to the individual control units where it is detected and decoded by the fire conmand decoder 80 of processor 62. If decoder 80 recognizes the fire command as authentic, it transmits a fine signal to firing logic module 81.
  • the firing logic itself is of conventional type and preferably comprise a capacitor discharge blasting machine. Such devices are well known and comprise a capacitor which stores a quantity of electricity. The capacitor is discharged into the firing circuit upon activation of a firing switch causing an electric blasting cap to detonate the explosive charge.
  • the charge means preferably comprises a shaped charge including a solid explosive 101 emplaced in back of conical liner 102 so as to direct the force of the explosion forwardly along the axis 103 of liner 102.
  • An electric blasting cap 104 is provided at the rear of charge 101 to detonate the explosive.
  • Cap 104 is connected to initiating switch 105 through electrically conducting leg wires 106.
  • Switch 105 is operably connected to switch activator 107 through linkage means 108.
  • Activator 107 is caused to operate and change the position of switch 105 upon receiving a signal, which may be electrical or optical, from the individual control unit associated with the charge byway of conductors 15.
  • a surge of electric current is supplied to the switch from capacitor discharge blasting machine 110 or similar device through conductor pair 111 and 112.
  • the entire charge 14 is preferably containedwithin housing means 113 which functions to protect the charge from damage during transport and placement. It is preferred also that an electromagnetic shielding means 114 be provided to completely surround the charge. Shielding means 114 and housing means 113 may be combined together in a single element.
  • conductor 111 which is one of the two conductors connecting blasting machine 110 with switch 105, branches to go to ground 121 and to a switch terminal post 122. Another branch of conductor 111 forms one of the leg wires (designated 106 in Figure 5) of blasting cap 104. The other conductor 112 from blasting machine 110 is directed to switch terminal post 123. The other leg wire 106 of blasting cap 104 branches to form a pair of opposed switch terminal posts 124 and 125.
  • switch contact bar 126 which is movable by switch activator means 107 ( Figure 5) between two positions. In the first position, the deactivated position shown in Figure 6, contact bar 126 connects switch terminals 122 and 124. As may be appreciated from the diagram, this shorts out and grounds the two leg wires 106 of cap 104 preventing any current flow through the bridge wire of cap 104. In its second position, the "fire" position shown in Figure 6-A, contact bar 126 connects terminals 123 and 125. This completes a circuit of conductor 111 through blasting cap 104 and returning through conductor 112 thus allowing blasting machine 110 to discharge causing the detonation of cap 104 and explosive 101.
  • the explosive charge 14 was illustrated in Figure 5 to be of shaped charge configuration, other types of charges may be equally useful depending upon circumstances.
  • a shaped charge either conical or linear, is most useful for gaining entrance into an enclosure as, for example, detaching a door from its hinges and latches. In other circumstances a charge might be configured to maximize its blast effect to stun and confuse persons in proximity to the charge.
  • detonating switches different from that one illustrated in Figures 6 and 6-A may be used to advantage.
  • the conductors 15 connecting each individual control unit 13 with its charge 14 are kept as short as possible so as to minimize induced currents while at the same time allowing the control units to survive the blast without damage.
  • Other details of design and construction may be modified without departing from the invention set forth in the appended claims.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Selective Calling Equipment (AREA)

Abstract

On fait détoner des charges explosives par télécommande dans des environnements caractérisés par des niveaux élevés d'énergie électrique et électromagnétique étrangère au moyen d'une unité séparée de commande pour chaque charge explosive (14). L'unité de commande (13) accepte des instructions codées transmises radioélectriquement par une unité de contrôle (11) et lorsque ces instructions remplissent des critères prédéterminés, l'unité de commande (13) fait détoner la charge (14). Chaque unité de commande (13) est connectée à sa charge explosive respective (14) par des conducteurs électriques ou optiques (15), à une distance suffisante pour permettre à l'unité de commande (13) de survivre à la détonation de la charge (14) sans subir des dommages.
PCT/US1989/005074 1986-11-06 1989-11-20 Detonation a distance de charges explosives Ceased WO1991007637A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US06/927,362 US4884506A (en) 1986-11-06 1986-11-06 Remote detonation of explosive charges

Publications (1)

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WO1991007637A1 true WO1991007637A1 (fr) 1991-05-30

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PCT/US1989/005074 Ceased WO1991007637A1 (fr) 1986-11-06 1989-11-20 Detonation a distance de charges explosives

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WO (1) WO1991007637A1 (fr)

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